TS4962

Application information

37/46

Figure 63.

Method for shorting pertubations to ground

In the case where the distance between the TS4962 output and the speaker terminals is

high, it's possible to have low frequency EMI issues due to the fact that the typical operating

frequency is 250kHz. In this configuration, we recommend using an output filter (as

represented in Figure 1: Typical application schematics on page 8). It should be placed as

close as possible to the device.

4.11

Several examples with summed inputs

Example 1: Dual differential inputs

Figure 64.

Typical application schematic with dual differential inputs

Ferrite chip bead

about 100pF

Gnd

From TS4962 output

To speaker

R1

R1

Cs

1u

GND

GND

Vcc

SPEAKER

Standby

R2

R2

E1+

E1-

E2-

E2+

In-

Stdby

In+

Out-

Out+

Vcc

1

4

3

7

8

6

5

GND

Internal

Bias

PWM

Output

Bridge

H

Oscillator

150k

150k

+

-

A

V

1

Out

+

Out

-

–

E

1

+

E

1

-

–

-------------------------------

300

R

1

----------

==

A

V

2

Out

+

Out

-

–

E

2

+

E

2

-

–

-------------------------------

300

R

2

----------

==

0.5V

V

CC

R

1

×

R

2

300

V

IC1

R

2

V

IC2

+

×

R

1

×

()

×

+

×

300

R

1

R

2

+

() 2R

1

×

R

2

×

+

×

--------------------------------------------------------------------------------------------------------------------------------

V

CC

0.8V

–

≤≤

V

IC

1

E

1

+

E

1

-

+

2

------------------------

=

and V

IC

2

E

2

+

E

2

-

+

2

------------------------

=